Plate glass surfacing table



Nov. 1, 1938. w. OWEN PLATE GLASS SURFACING TABLE 2 Sheets-Sheet 1 Filed March 29, 1958 jay-J.

'6' o o o INVENTOR. Wu.- 1... lnM O WEN BYQDR 4g vmu/ ATTORNEYS.

Nov. 1, 1938. w. ow 2,134,798

PLATE GLASS SURFACING TABLE Filed March 29, 1933 2 Sheets-Sheet 2 T. O 4 .11 I? 15 INVENTOR Wu... 1.. lF-N'W O WEN- ATTORNEYS.

Patented Nov. 1, 1938 UNITED STATES PATENT OFFICE 2,134,798 PLATE cuss suaracmc TABLE Application March 29, 1938; Serial No. 193,673 3 Claims. (Cl. 51-240) The invention relates to tables for use in surfacing plate glass, in which the tables are passed in a continuous train beneath a series of grinding and polishing runners. The heat developed in 5 the polishing operation causes the tops of the tables to warp or bow slightly, so that they are no longer true and flat, and when returned to the grinding end of the cycle for reuse, this bowed or warped condition persists to a certain extent,

10 so that the glass sheets are not ground to uniform thickness, the sheets being ground thinner in the portions overlying the centers of the tables than those overlying the sides of the tables. The object of the present invention is to provide an 1 improved table construction in which the warping of the table tops due to the heat developedin polishing is substantially eliminated. A further object is the provision of a surfacing table having the characteristics specified which is no 20 more costly than the standard surfacing table and which has the same rigidity and durability. One embodiment of the apparatus is shown in the accompanying drawings, wherein:

Figure 1 is a plan view. Fig. 2 is a side ele- 25 vation. Fig. 3 is a transverse section on the line IIL-III of Fig. 1. And Fig. 4 is an enlarged partial section also on the line III-III of Fig. 1.

Referring to the drawings, 5 is the body portion of the table preferably of cast steel or cast 30 iron carried upon the wheels 6, which ride upon the track 1. The upper portion of the car comprises the top 8 in the form of a plate of substantial thickness and the ribs 9 and i integral with the top. The ribs 9 extend transversely of 35 the top while the ribs 10 extend longitudinally thereof, thus dividing the lower side of the top into rectangular sections, the ribs intersecting where they pass each other. This provides a very rigid construction, well adapted to stand the 40 stresses incident to grinding and polishing. Along the edges of the plate 8 the usual pins II are provided extending through suitable perforations and serving as means for positively anchoring the glass sheet which is carried on the 45 top of the table from lateral movement.

The upper surface of the top 8 is fiat and smooth, and is provided with two sets of slots l2 and iii, the slots 12 extending the length of the table, while the slots l3 extend transversely there- 50 of, thus dividing the top into a plurality of rectangular sections, as indicated in Fig. 1. These slots are formed by a sawing action, and as indicated in Fig. 3, extend down to a point below the level of the underside of the plate 8. They 55 are preferably located on the center lines of the ribs 9 and I0, whichlocation permits the slots to be relatively deep without any appreciable weakening of the table top. This expedient of slotting the top of the table, substantially reduces any tendency to warping which would otherwise occur when the top is heated up due to the polishing action. When the top is sub-divided in this manner, each section I4 is independent of adjacent sections, so that while each section may warp slightly, the effect is not cumulative and the top as a whole remains substantially flat and true, even though raised to a relatively high temperature during the polishing operation. The upper portion of the grooves is preferably filled with plastic, material l5, such as rubber for prevening the plaster used in cementing the glass to the table top from filling the grooves. As indicated above, the placing of the slots in alinement with the ribs permits these slots to be made relatively deep without adversely affecting the strength and rigidity of the table and constitutes a very deep, simple expedient for overcoming the difficulty as to warping heretofore referred to.

I am aware that it is not broadly new to saw a table top, so as to divide it into rectangular sections, as shown for example in the patent to Jacob Soderberg No. 1,983,009, dated December 4, 1934, but in such cases, the top is materially weakened intermediate the reinforcing ribs used on the underside of the top, and the car construction is made more complicated and expensive, as compared with the construction herein disclosed, wherein the slots are in line with the reinforcing ribs, so that there is no decrease in the rigidity of the table top, and it is possible to use one integral casting of about the same cost as a standard table.

What I claim is:

1. A plate glass surfacing table comprising a metal top plate having a flat upper face and a plurality of intersecting spaced longitudinal and transverse ribs projecting from the lower side of the plate and integral therewith, the upper side of the plate being provided with a plurality of intersecting longitudinal and transverse slots in line with said ribs dividing the upper face of the table into rectangular sections.

2. A plate glass surfacing table comprising a metal top plate having a flat upper face and a plurality of intersecting spaced longitudinal and transverse ribs projecting from the lower side of the plate and integral therewith, the upper side of the plate being provided with a plurality of intersecting longitudinal and transverse slots in line with said ribs dividing the upper face of the 2 I 2,1s4,7ga

table into'rectangular sections, said'slots extendof the plate being provided with a plurality of intersecting longitudinal and transverse slots in line with said ribs dividing the upper face of the table into rectangular sections. and a plastic filler in said slots.

WILLIAM OWEN. 

